In a mixing bowl, combine graham cracker crumbs, melted butter, and sugar until well-blended. Press the mixture firmly and evenly into the bottom of mini dessert glasses using the back of a spoon.

Set these aside to allow the crust to firm up.

In a separate bowl, beat the softened cream cheese and low-fat vanilla Greek yogurt together until smooth and creamy.

In another bowl, whisk together the fat-free sweetened condensed milk and freshly squeezed key lime juice. Gradually add this mixture to the cream cheese blend, mixing until fully combined.

If desired, divide the filling into two portions and add a few drops of green food coloring to one half, stirring gently.

Using a piping bag, alternately pipe layers of the plain and colored filling into the prepared dessert glasses.

Repeat until the glasses are filled to the top.

Cover the assembled desserts with plastic wrap and refrigerate for at least 2 hours.

Remove the mini desserts from the refrigerator and garnish with whipped cream, lime zest, and graham cracker crumbs.

Serve immediately.